A call center supervisor inspects the quality of 50 customer…

A call center supervisor inspects the quality of 50 customer service calls per shift for 10 shifts. The number of calls with service issues in each shift is shown below. Shift # Defective Fraction Defective Shift # Defective Fraction Defective 1 3 0.06 6 3 0.06 2 2 0.04 7 2 0.04 3 5 0.10 8 6 0.12 4 1 0.02 9 1 0.02 5 4 0.08 10 3 0.06   Using z = 3, which of the following correctly states the UCL and LCL for the p-chart?

A company records monthly unit sales and uses a 3-month weig…

A company records monthly unit sales and uses a 3-month weighted moving average to forecast demand. The weights are: 3/6 for the most recent month, 2/6 for two months ago, and 1/6 for three months ago. Monthly sales are shown below. Month Sales (units) March 20 April 26 May 32 June 38   Using the weighted moving average with the weights described above, what is the forecast for July?